Opposite effects of sulfated cholecystokinin on DA-sensitive adenylate cyclase in two areas of the rat nucleus accumbens

European Journal of Pharmacology
J M StudlerJ P Tassin

Abstract

The nucleus accumbens of the rat receives a mixed DA/CCK8 innervation in its posterior part while its anterior part is innervated by distinct DA and CCK8 fibres. In vitro, the addition of CCK8 (0.3-1 microM) potentiated the activating effect of DA (10-30 microM) on adenylate cyclase in tissue homogenates obtained from the posterior part of the nucleus accumbens, whilst this activating effect was reduced by CCK8 in the anterior part. These results suggest the existence of two types of regulation of the D1 receptor by CCK8 depending on the identity (mixed or not mixed) of their innervating fibres.

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Citations

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